person with specialist knowledge
as defined in Directive 2007/23/EC of the European Parliament and of the Council of 23 May…, Article 2, point (10) (Definitions)
a person authorised by a Member State to handle and/or use on its territory category 4 fireworks, category T2 theatrical pyrotechnic articles and/or category P2 other pyrotechnic articles as defined in Article 3.